Riding a Bike at Midnight

When I got off work lately, I remembered a good old memory of when I rode my bicycle. / Recently when I got off work, I remembered mya good old memory of when I rode my bicycle.

In the university, my friends and I went to Jeju iIsland, which is the biggest island in Korea.

At tThere, we traveled around the island by bicycle.

We visited a lot of beautiful places and ate tasty foods.

I saw many starts oin the sky and heard bugs sonthe sound of bugs.

If I have a changce, I want to go there and ride thea bike again.

Riding a Bike at Midnight

Or you could say "Bike Riding at Midnight" or "Midnight Bike Ride."

When I got off work laterecently, I remembered my good old memory when I rode my bicycle.

Lately is more describing a period of time, it sounds weird for a single event.

In the university, my friends and I went to Jeju island which is the biggest island in Korea.

"In the universitiy" sounds like Jeju island is in the univerity too.

At tThere, we traveled around the island by bicycle.

The most impressive moment was thatwhen I took my bike out during the night.

"Impressive" is a bit odd here, like you're showing off. Maybe "most memorable" or "best".

I saw many starts oin the sky and heard bugs songs.

I couldn't forget the scene and feelings.

Maybe "I will never forget...". "Couldn't" sort of implies you couldn't forget in the past, but have forgotten it now, which is probably not true.

If I have amy situation changes, I want to go there and ride the bike again.

Or maybe, "If I go on a trip, I want to go there..."